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Have you looked under the seat for a label with the model#? At some of the sites at the top of the page, they have a bar at their site where you can look at all the diff models to find yours and then see a parts diagram showing all the parts. Yours have the high speed control on the right handlebar? I got one of CJB's turbo timers that allows a soft-start when over-volting up to 18v that ramps up the speed in a variable time you can set. As far as a hand throttle like a motorcycle, there's china models on ali express (I think that's the name) something like ebay, that have variable throttle control. You might have to add an ESC (electronic speed control) , read up on that in the ESC section on this site. Just like I've been doing the last 8 months, READ, READ, READ, here on this great site!